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manifest.json
{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "name": "Simple Notebook",
  "version": "0.0.0.1",
  "description": "Just a pop-up notebook without ads, a complicated filesystem, nor a bazillion settings (but dark mode!).",
  "manifest_version": 2,
  "incognito": "split",
  "browser_action": {
    "default_popup": "index.html"
  },
  "icons": {
    "128": "icon.png"
  }
}